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The Collaborative International Dictionary
Bacitracin A

bacitracin \bacitracin\ n. (1940) [Bacillus + Margaret Tracy, (a child whose tissues contained Bacillus subtilis) + -in.
--RHUD.] a polypeptide antibacterial antibiotic of known chemical structure effective against several types of Gram-positive organisms, and usually used topically for superficial local infection.

Note: It is produced by Bacillus subtilis and Bacillus licheniformis, and as produced commercially is composed of several closely related substances. The predominant component, Bacitracin A, has a formula C60H103N17O16S, and contains D-ornithine, D-phenylalanine and D-glutamine residues as well as the L-isomers of leucine, isoleucine, histidine, asparagine and aspartic acid.
--[MI11]